A) Keep them in larval stage
B) Hasten their metamorphosis
C) Slow down their metamorphosis
D) Kill the tadpoles
Correct Answer: B
Solution :[b] Thyroxine controls tissue differentiation and metamorphosis of tadpole larva into frog. Gundernatch (1912) proved that metamorphosis of tadpole into adult frog is controlled by thyroxine. Addition of thyroxine in water will hasten the metamorphosis.
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